TAS2780 datasheet(80/97 Pages) TI

80 / 97 page

Table 9-1. Recommended External Components (continued)

COMPONENT

DESCRIPTION

SPECIFICATION

MIN

TYP

MAX

UNIT

PVDD Decoupling Capacitor

Type

X7R

Capacitance, 20% Tolerance

100

Rated Voltage

AVDD Decoupling Capacitor

Type

X7R

Capacitance, 20% Tolerance

4.7

µF

Rated Voltage

DREG Decoupling Capacitor

Type

X7R

Capacitance, 20% Tolerance

µF

Rated Voltage

IOVDD Decoupling Capacitor

Type

X7R

Capacitance, 20% Tolerance

µF

Rated Voltage

C8, C9

Bootstrap Capacitors

Type

X7R

Capacitance, 20% Tolerance

100

Rated Voltage

Lf1, Lf2 (optional)

Optional EMI filter inductors. These are

not recommended as it degrades THD+N

performance. The TAS2780 device is a

filter-less Class-D and does not require

these bead inductors.

Impedance at 100MHz

120

DC Resistance

0.095

DC Current

Cf1, Cf2 (optional)

Optional EMI filter capacitors (must use Lf2,

Lf3 if Cf1, Cf2 used)

Capacitance

Filter resistor for noise reduction

Resistor, 20% Tolerance

kΩ

Filter capacitor for noise reduction

Capacitance, 20% Tolerance

10/RF(kΩ)

Rated Voltage

9.3 Design Requirements

For this design example, use the parameters shown in Section 9.2.

Table 9-2. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Audio Input

Digital Audio, I2S

Current and Voltage Data Stream

Digital Audio, I2S

Mono or Stereo Configuration

Mono

Max Output Power at 1% THD+N,

RL = 4 Ω

25 W

9.4 Detailed Design Procedure

9.4.1 Mono/Stereo Configuration

In applications the device is assumed to be operating in mono mode. See Section 8.3.1 for information on

changing the I2C address of the TAS2780 to support stereo operation. Mono or stereo configuration does not

impact the device performance.

9.4.2 EMI Passive Devices

The TAS2780 supports spread spectrum to minimize EMI. It is allowed to include passive devices on the

Class-D outputs. The passive devices Lf1, Lf2, Cf1 and Cf2 from Figure 9-1 have recommended specifications

provided in Table 9-1. The passive devices of the output filter have to be properly selected to maintain the

stability of the amplifier. See Section 8.4.5 for details.

9.5 Application Curves

At TA = 25 0C, fSPK_AMP = 384 kHz, input signal fIN = 1kHz - Sine, Load = 4Ω + 15μH, unless otherwise noted.

TAS2780

SLOSE75A – FEBRUARY 2022 – REVISED JUNE 2022

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